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www.ncerthelp.com (Visit for all ncert solutions in text and videos, CBSE syllabus, note and many more). Physics Notes Class 12 Chapter 11 Dual. Nature of Radiation and Matter. Cathode Rays. Cathode rays are the stream of fast moving electrons. These rays are produced in a discharge tube at a pressure below 0.01 rom
Dual Nature of Radiation and Matter. Emission of electrons: We know that metals have free electrons (negatively charged particles) that are responsible for their conductivity. However, the free electrons cannot normally escape out of the metal surface. If an electron attempts to come out of the metal, the metal surface
DUAL NATURE OF MATTER AND RADIATIONS. 1. Photons. 2. Photoelectric Effect. 3. Experimental Set-up to study Photoelectric Effect. 4. Effect of Intensity, Frequency, Potential on P.E. Current. 5. Graphical representation of variation of P.E. Current. 6. Laws of Photoelectric Effect. 7. Einstein's Photoelectric Equation. 8.
DUAL NATURE OF MATTER AND RADIATION. 1. Dual nature of matter and radiation. Electron Emission : The phenomenon of emission of electrons from a metal surface is called electron emission. It is of following types : (i) Thermionic emission : By heating, thermal energy is imparted to free electrons to enable them to
DUAL NATURE OF MATTER AND RADIATION. Photons: Electromagnetic radiation travels in the form of small packets of energy which are called photons. Important Properties of photons: i. According to quantum theory of light, radiation from any given source always travel in the form of photons. ii. The energy of photon is
387. Dual Nature of Radiation and Matter particles. They were found to travel with speeds ranging from about 0.1 to 0.2 times the speed of light (3 ?108 m/s). The presently accepted value of e/m is 1.76 ? 1011 C/kg. Further, the value of e/m was found to be independent of the nature of the material/metal used as the cathode.
Dual Nature Of Matter And Radiation Class 12. Notes Pdf Download. • The elementary particle in an atom having negative charge of magnitude 1.6 x 10-19 C and mass of 9.1 x 10-19 kg is called electron. • There are four types of electron emission, namely, Thermionic Emission, Photoelectric Emission, Field Emission and
DUAL NATURE OF RADIATION AND MATTER. Important Points: 1. J.J. Thomson and Sir William Crookes studied the discharge of electricity through gases. At about 0.01 mm of Hg and at high voltage invisible streams called cathode rays are emitted. J.J. Thomson called them “streams of negative corpuscles". Johnston
QUESTION BANK WITH ANSWERS. DUAL NATURE OF MATTER AND RADIATION. 2 MARKS QUESTIONS. 1. The work function of lithium is 2.3 eV. What does it mean? What is the relation between the work function and threshold wavelength of a metal? Ans. To eject an electron from lithium 2.3 eV work is to be done.
Matter has a dual nature—particle and wave. Its particulate nature dominates the behavior of large-scale objects; the wave nature dominates small-scale (submi- croscopic) behavior. The wave properties of submicro- scopic matter limit the motion of particles in such a way that the particles cannot have unique values for
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